Dr. Sunbeam Solutions Pvt Ltd Provides Different types of solar panels and their prices in India Solar panels can be categorized on the basis of various parameters like the number of junctions they have or the generation they belong to. On the basis of the number of junctions, there are single-junction and multi-junction solar panels that differ in terms of the number of layers in the solar panel. Then there is another way of classifying solar panels i.e. with regards to the generation they belong to.